Fix logic when doing a name based channel search for a structure when you want to start from a specific point in the channel list. (issue #9324 reported by slavon)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@68157 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -1046,6 +1046,11 @@ static struct ast_channel *channel_find_locked(const struct ast_channel *prev,
 				 * want to return NULL, instead of trying to deref NULL in the
 				 * next section.
 				 */
+				prev = NULL;
+				/* We want prev to be NULL in case we end up doing more searching through
+				 * the channel list to find the channel (ie: name searching). If we didn't
+				 * set this to NULL the logic would just blow up
+				 */
 			}
 			if (name) { /* want match by name */
 				if ((!namelen && strcasecmp(c->name, name)) ||